Well when I used to work as an instructor and carried a normal octopus it used to be in the pocket of my jacket or ADV type BC - it wasn't all that noticable but I had expend valuable seconds to put it there.
More seriously, at the time and place (mid 80s-early90s / Australia / Indo Pacific) the fashion was to have the long hose (it wasn't that long) on the primary reg in your mouth, which you were supposed to donate while you found your octopus for your own use.
These days I use a back inflation BC for single diving and a backplate and wing for doubles - so pockets are smaller/less available. And I am lazy and can't be bothered fiddling around with another second stage unless I have to. I would rather spend time setting up cameras, integrated weight pockets, lights ...
With the backplate and doubles, I have a normal octopus with one reg on a long hose and the other on a necklace, but I still use an integrated inflator on the wing so I have a fast inflator that is easy to service, and most importantly, so I don't have to swap LP hoses when I move my primary reg and backup computer in its consol between the doubles and singles set ups.
Just my preference, and I think that personal preference is the main thing with regard to this issue - if you want to use a normal octopus that is fine - some of my best friends use them - I just wanted to make the point that integrated inflators can be reliable and easy to use and may have some advantages for some people.
More seriously, at the time and place (mid 80s-early90s / Australia / Indo Pacific) the fashion was to have the long hose (it wasn't that long) on the primary reg in your mouth, which you were supposed to donate while you found your octopus for your own use.
These days I use a back inflation BC for single diving and a backplate and wing for doubles - so pockets are smaller/less available. And I am lazy and can't be bothered fiddling around with another second stage unless I have to. I would rather spend time setting up cameras, integrated weight pockets, lights ...
With the backplate and doubles, I have a normal octopus with one reg on a long hose and the other on a necklace, but I still use an integrated inflator on the wing so I have a fast inflator that is easy to service, and most importantly, so I don't have to swap LP hoses when I move my primary reg and backup computer in its consol between the doubles and singles set ups.
Just my preference, and I think that personal preference is the main thing with regard to this issue - if you want to use a normal octopus that is fine - some of my best friends use them - I just wanted to make the point that integrated inflators can be reliable and easy to use and may have some advantages for some people.